Question about GMC Sierra 1500

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My 1995 gmc sierra has very low oil pressure when the engine worms up.Can you help se find the solution? Thank You

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  • 231 Answers

It could be that your oil pump is going or it may be time for an engine over haul. unless you have recently done an oil change and used the wrong grade of oil or have gone to a very cheap oil. this is providing that your oil level is good.
remember that GM's thrive on clean oil.

Posted on Oct 12, 2008

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1989 gmc SIERRA DOES NOT START. HAVE HAD A NEW FUEL PUMP PUT IN RECENTLY. IF THE OIL LEVEL IS TOO LOW CAN THIS BE A CAUSE? DOEW IT HAVE AN AUTO SHUT DOWN IF THE OIL IS TOO LOW?


Hello George.

When starting up your pickup the computer activates the fuel pump relay as long as it is cranking.
When the engine starts it builds up oil pressure. This pressure activates a switch that applies 12VDC to the fuel pump.
So regardless of oil pressure it should fire up when cranking and then shut off momentarily after if no oil pressure develops.
This should address your question.

Basic diagnostics are needed here George. Check fuel pressure and ignition to begin and then home in on the problem.
Unfortunately I could not begin to hazard a guess at this point what it is as it could be anything.

Thank you for using FixYa.

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Hi...2008 gmc sierra crew...check engine light came on thought maybe was standard just before hitting 30,000 then noticed low oil pressure ( 20 ) then noticed clacking noise?


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What's the engine oil capacity for the 1994 gmc sierra v-6 engine?


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1 Answer

Low oil when engine warms up gmc sierra 1995


30-40 psi of oil pressure is fine for many vehicles including your GMC. I am assuming that the truck has more than 100,000 miles on it and still has the original engine in it. By rule of thumb you only need 10 psi per 1000 rpms in a typical street driven engine to give adequate oil pressure to keep the bearings from oil starvation. The oil pressure is typically higher when initial start up occurs because it is more viscous due to the temperature of the oil as the engines oil warms up the visconsity thins out and the oil flows more smoothly. The drop in oil pressure is a normal occurance. Above 45 is more than required for a daily driven street engine. I believe that the specs on that engine only list 30- 45 psi.

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